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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 14 : Conductors and Resistors"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.1, Page No 336"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"n_x1 = 1.0 # atomic level\n",
"n_y1 = 1.0 # atomic level\n",
"n_z1 = 1.0 # atomic level\n",
"n_x2 = 2.0 # atomic level\n",
"L = 10.0 # lattice parameter in mm\n",
"h = 6.626e-34 # plank constant\n",
"m_e = 9.109e-31 # mass of electron in kg\n",
"\n",
"#Calculations\n",
"E1 = h**2*(n_x1**2+n_y1**2+n_z1**2)/(8*m_e*(L*1e-3)**2)\n",
"E2 = h**2*(n_x2**2+n_y1**2+n_z1**2)/(8*m_e*(L*1e-3)**2)\n",
"E = E2-E1 # energy difference \n",
"\n",
"#Results\n",
"print(\"Energy difference is %.2e J \" %E)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Energy difference is 1.81e-33 J \n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.2, Page No 340"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"tau = 2e-14 # collision time of electron in s\n",
"e = 1.602e-19 # charge on electron\n",
"m_e = 9.1e-31 # mass of electron in kg\n",
"\n",
"#Calculations\n",
"n = 6.023e23*8960/0.06354\n",
"sigma= n*e**2*tau/m_e\n",
"\n",
"#Results\n",
"print(\"Conductivity of copper at 300 K is %.1e ohm^-1 m^-1 \" %sigma)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Conductivity of copper at 300 K is 4.8e+07 ohm^-1 m^-1 \n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 14.3, Page No 341"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"#initialisation of variables\n",
"r_cu = 1.8e-8 \t\t# resistivity of pure copper in ohm-m\n",
"r_Ni_cu = 7e-8 \t\t#resistivity of copper 4% Ni in ohm-m\n",
"per1 = 4.0\t\t\t#impurity in percent\n",
"per2 = 1.0\t\t\t # impurity in percent\n",
"\n",
"#Calculations\n",
"r = (r_Ni_cu-r_cu)*per2/per1 \t# resistivity of copper 1% Ni in ohm-m\n",
"\n",
"#Results\n",
"print(\"Resistivity due to impurity scattering of 1 %% of Nickel in copper lattice is %.1e ohm-m\" %r)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Resistivity due to impurity scattering of 1 % of Nickel in copper lattice is 1.3e-08 ohm-m\n"
]
}
],
"prompt_number": 4
}
],
"metadata": {}
}
]
}
|
